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Finding the Fourth Proportional to 485,759.72, 670,119.62 and 315,931.88

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Solution

The fourth proportional to 485,759.72, 670,119.62 and 315,931.88 is: 435,837.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,759.72 : 670,119.62 = 315,931.88 : x
  2. Step 2: Convert to fraction form
    485,759.72/670,119.62 = 315,931.88/x
  3. Step 3: Cross multiply
    485,759.72x = 670,119.62 × 315,931.88
  4. Step 4: Simplify right side
    485,759.72x = 211,712,151,371.49
  5. Step 5: Solve for x
    x = 211,712,151,371.49/485,759.72
  6. Step 6: Final answer
    x = 435,837.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.